Okay, there seems to be a bit of a confusion of terminology here...
Pressured breathing for me are those tiny breaths you see women giving birth do, or people who don't know how to apply strength and are gassed and you tell them to breath.

What I think you are talking about is "controlled breathing" where I try to breath into my belly button and at the same time flex my abs against this motion, this will tighten my torso and lock my spine into place. THAT I do.

Now there were to issues, Where do I inhale and where do I exhale on the lift?
Here I have two options in my mind. (lets do it on the example of the squat)
1) I inhale, go down, and while I come up I slowly and deliberately start to exhale with most of the breathing out process being done when I am back at my starting position. Rinse and repeat.
2) I inhale, do the entire move (down and up again) then I exhale.

I am doing number one right now.

The other issue I asked you russ, how will addressing my set of 5 as 5 sets of 1 change in terms of pause between reps and how would this impact my strength development?

I will try to get a video on Wednesday because then I will do Squat, Press and Dead on the same day... Lets so how that will go.

Holding your breath the whole time means the spine is protected the whole time. I usually breath between each full squat movement, deadlift, and clean. I can get away with several press reps before breathing.

sorry for the quality etc. had to place the cam on the dumbbell rack and it turned during press

Is my form okay?

That stupid feeling in my shoulder is acting up and it feels like I have a nerve pinched or something, I have to squeeze a certain spot and move it in a certain way (it sounds like it is setting itself back in place) to make it stop feeling funny. If it ain't better today after Jits I might take a day off and ice that thing.

Nope, I am doing 3X10 and 1x5 on each end of the bar. The angle makes it hard to see I guess.
I don't use 20kg plates (because of the way my warmup sets are laid out) I use 15kg plates max (on the squat I am at 15kg,2x10kg,5kg,2kg each end)